From the answer:
Hi there, , Let's get you to the right support who currently handle discount categories.... I suggest contacting our QuickBooks Point of Sale Technical Team so they can help check the discount settings on your account.

From the answer:
Hello there, , I'm here to provide you a solution on how to sync your POS with the Go-Payment app.... Please follow the steps outlined below: Step 1: Activate Mobile Sync in Point of Sale.

From the answer:
Thank you for letting us know your experience, harlin2626 .... I can help you resolve the error you've encountered when accessing your QuickBooks Point of Sale The error that you've encountered can be caused by Incorrect Local Area Network (LAN) setting